What is the difference between reindex and vacuum's impact on index file? I deleted an indexed row. Running either vacuum or reindex shows the index entry for the row is removed from the index page. I was under the impression that only reindex will remove dangling index entries. I am guessing that vacuum will not shrink the index file and will only add deleted index entries in the free space file for the index? But REINDEX is recreating the index file from scratch so it is like vacuum full for index?